Kriesi built the theme on a MAC environment. I’m sure he’ll know of this issue if it exist. I myself can’t check this on an actual IOS device so let’s wait for his response. Anyway, like you said the icons are rendering properly Windows 7 Chrome, Safari and Firefox. On another thread, this is what Kriesi said:

Hey Monique!
Seems this is an Apache Server configuration problem with font files. I added the following to the htaccess file and it seems to work for me now:
http://pastie.org/8390019
For everyone else encountering this issue please try to do the same :)
Also for anyone else and my team: this might come in handy when dealing with font problems: http://www.fontsquirrel.com/blog/2010/11/troubleshooting-font-face-problems